Skiving-machine.



E. F. DAVENPORT.

SKIVING MAGHINE. APPLIoATIoN FILED DBO. 26, v1911.

1,029,176. Patented June 11, 1912.

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EUGENE F. DAVENPORT,-OE MELROSE, MASSACHUSETTS, ASSIGNOR TO UNITED SHOE MACHINERY COMPANY, OF PATERSON, NEW JERSEY, A CORPORATION 0F NEW JERSEY.

SKIVINGMACHINE.

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Specification of Letters Patent.

Patented June 11, 1912.

To all 'whom t may concern Be it known that l, EUGENE F. DAVENPORT, a citizen of the United States, residing` at Melrose, in the county of Middlesex and State of-Massachnsetts, have invented certain new and nseful Improvements in Skiv ing-hflaehines; and l do hereby declare the following to be a full, clear, and. exact description of the invention, such as will enable others skilled in the art to which it appertaius to make and use the same.

The presentinvent-ion relates to ski'ving machines. and more }f articularly to machines which comprise a rotary cylindrical skiving` knife, a presser foot and a feed roll arranged to hold the leather in position and feedv it'to the knife.I Among the various types of feed rolls which are employed with this class of machines, it is found that metal feed rolls provided with a toothed periphery have many advantages but that if these feed rolls are not cleaned continually they clog with skivings and particles of leather and soon become inoperative. maintain these rolls in an etlieicnt working condition it is necessary to positivelyremove and eject the, foreign accumulations from the surface of the roll however firmly they may adhere thereto and in whatever position the roll may loe.

The object of the present invention is to eflcetually remove the skivings and other material from the surface of the roll and ,maintain the feed roll free and clean enabling it to-operate efficiently for an indefinite period. `With this object in view, the various featuros of the invention comprise eertainnovcl features of col'istruction, combinations and arrangements of parts hereinafter described and claimed7 the advantages of which will he obvious to those skilled in theart 'from the following de` scripti on. l

In the 'accompanying drawings illustrating the preferred form of the invention, Figure 'l re]n'ese,nts a side elevation of a skiving machine embodying the invention; Fig. 2 is a detail illustrating a rear side elevation Vpartly in section of a metal feed roll and stripper cooperating therewith; Fig. 3 is a detail illustrating a frontside elevation of the feed roll and mounting therefor taken upon the line 3-A3 of F ig. 1; and Fig. Lt, is Ia detail .illustrating a cross section of the feed vroll with the ski-ving ln order to knife and stripper arranged in cooperative relation thereto.

Certain parts of the machine are similar in construction and mode of operation to the machine shown and described in the co pending application of Alexander, Serial No. 621,679, tiled April 17, 1911, and will be only briefly described herein in consequence thereof.

The machine is provided with.a cylindrical skiving knife indicated at 3 which is mounted within a casing 4 and projects upwardly throl'lgh an opening in the same into a position to act upon the material. The material to be skived is fed to the knife 3 by a positively driven feed roll 5 which is yieldingly.supported within the. knifel and which cooperates with apresser foot 6 1nounted without the knife and arranged to act as a gage for properly presenting the work to the, knife. The presser foot G is carried by a block 7 slidingly mounted in vertical gnideways formed` in the end of an oven hanging arm 8 and an adjusting mechanism (not shown) is provided for determining` the initial vertical position of the 'presser foot in order to bring it into cooperative relation with the knife edge. The work is guided under the presser f'oot. by an adjustable side gage t) which engages the edge of the material as it is fed to the knife. The feed roll is journaled at its opposite ends in the arms 15 and 1G of a head 17 which'is pivotally connected .at 1f) to a suppdrting arm 20. ln order to yieldingly vretain the roll in its working position, a.I

bears against the carrier and serves to retain thc carrier in engagement with a stop to position the roll in operative relation to the knife and y presser foot. be rotated in the carrier 27 by an operating handle. 30, thus oscillating the arln 20 to adjust the feed roll 5 'circumi rent' illy of the skiving knife. With the bove described The shaft 26 may construction, the feed roll has provision for a yielding movement about one end in the plane of the knife edge, a bodily movement to and from the knife edge,y and an adjustment eircumferentially of the knife.

When' employing a metal feed roll, it is essential that the periphery of the roll be l provided with teeth or other means for insuring a positive feed f the work. The roughened or toothed periphery of the feed. roll accumulates leather skivings which are carried aroundupon the roll clogging the teeth, and preventing the positive feed of the' Work. In addition the material often collects in bunches on the roll causing the formation of an imperfect skiving, `as the surface of the feed roll is made uneven and does not conform to the curvature of the knife. lIn the present invention, the skivings and other material are positively re- 1 moved from the roll by a stripper supported adjacent to the under side of the feed roll andv consisting of a series of rigidfingers Which enter and fit closely in'narrow slots formed in the surface of the feed roll. -'lhe feed roll shown in the illustrated embodiment of the invention is provided with a plurality of teeth arranged to grip and feed the lWork positively forming what 4is known as aA sewing machine feed. .'.lhe'stripper 'is supported by downward extensions formed onv the armsl 15 and 16' respectively and is providedrwith a series of lingers 35 which project upwardly into the annular recesses '36 formed in .the surface of the feed roll.

vAll of the stripper fingers are rigidly secured to a transverse rod 37 carried by the vdownward extensions, and this construction constltutes means for maintaining the fm- 40 gers in permanent engagement with the bottom of the slots 3G. Each finger' 35 as shown clearly in Fig. 4 consists of a thin wedge-shaped member tapering to a pointwhich bears upon the bottom of the recess and-fits closely within it. By constrmtting the fingers of the stripper ilrtllis -'ma1n1er, they may be made exceedingly thin rwithout impairing the rigidity, thereby enabling narrow, slots to be used and preventing the 'material to beskived from working' into the slots and forming an imperfect skiving. The slots are too narow to allow the skivings and' chips to work into them to any considerable depth and as the ends of the fingers are located beneath the surface they engage under and positively remove all the material even when it adheres 4firmly to the surface of the roll. With the above described construction, a simple and compact umechanism is provided for positively ejecting any accumulation from the surface of the roll which partakes of all movements of theroll during the operation of the machine, avoiding the necessity of a separate adjustment or `the provision of aV yielding support to` compensate for movement between the stripper andfeedA roll.

lfVhile it is preferred to employ the specilic construction and arrangement of parts shown and described, it will be understood that this construction and arrangement is not essential except so far as specified in the claims and may be changed or nmodified Without"departing from the broader features of the invention.

Having thus described the invention, what is claimed is l. A skiving machine having, in combination, a knife, a presserefoot, a feed roll provided With a series ofgrooves formed in its surface and -having provision for a tipping movement in the plane of the knife edge, a bodily movement to and vfrom the knife edge, and stripper fingers supported adja- "cent to the feed roll and projeeting'into said grooves formed in the surface of the roll, substantially as described.

2. A skiving machine having, in combination, a knife, a presser foot, a feed -roll pro vided with a series of narrow slots formed in its surface and having provisionl for a tipping movement in the plane of the knife edge, a bodily movement to and from the knife edge and thin wedge-'shaped fingers closely received in the slots, each finger having a ointed end engaging with the bottom of) its respective slot, and means` for rigidlymaintaining the fingers in permanent engagement with the feed roll, substantially as described.

3. A skiving machine having, in combination, a cylindrical knife, a presser foot sup ported above the knife, a feed, roll supporti ed `within the knife and provided .with a series ot' slots in its surface, a pair of arms in which the feed roll is journaled having 'downward extensions, a transverse rod mount'ed'inl the extensions and a plurality of stripper fingers rigidly secured-to the rod `and received closely into said slots formed in the feed roll, substantially as "described, i EUGENE F. DAVENPORT.

Witnesses: i Y

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